This blog will list news about all aspects of scorpion biology and important taxonomical updates from The scorpion Files. The Scorpion Files is a leading information source about scorpions, and has among others an updated list of all extant families, genera and species.(C) Jan Ove Rein and The Scorpion Files.

24 March, 2015

It is well known that scorpions use venom in prey capture and defense. This is normally done by injecting venom thought the scorpion's stinger. It is less known that a few species also can spray venom up 50 cm away. This behavior has only been reported from seven species in the South African genus Parabuthus Pocock, 1890 (Buthidae). It has been assumed that the venom spraying behavior has an anti-predator effect against potential predators of scorpions. Getting venom spray into the eyes is probably also harmful for humans, as many Parabuthus scorpions are of medical importance.

Nissani and Hayes have now published a very interesting analysis of the venom spraying behavior in Parabuthus transvaalicus Purcell, 1899, a medical important species from South Africa. Their study supported the hypothesis that that P. transvaalicus modulates venom spraying depending on level of threat. The authors argue that venom spraying increase the likelihood that venom makes contact with sensitive tissues of the predator, particularly its eyes. The authors believe that there is a possibility that scorpions modulate the quantity of venom expelled during spraying, but this requires further investigations.

Abstract:Many animals use chemical squirting or spraying behavior as a defensive response. Some members of the scorpion genus Parabuthus (family Buthidae) can spray their venom. We examined the stimulus control and characteristics of venom spraying by Parabuthus transvaalicus to better understand the behavioral context for its use. Venom spraying occurred mostly, but not always, when the metasoma (tail) was contacted (usually grasped by forceps), and was absent during stinging-like thrusts of the metasoma apart from contact. Scorpions were significantly more likely to spray when contact was also accompanied by airborne stimuli. Sprays happened almost instantaneously following grasping by forceps (median = 0.23 s) as a brief (0.07 - 0.30 s, mean = 0.18 s), fine stream (< 5 * arc) that was not directed toward the stimulus source; however, rapid independent movements of the metasoma and/or telson (stinger) often created a more diffuse spray, increasing the possibility of venom contact with the sensitive eyes of potential scorpion predators. Successive venom sprays varied considerably in duration and velocity. Collectively, these results suggest that venom spraying might be useful as an antipredator function and can be modulated based on threat.

19 March, 2015

Contreras-Felix and co-workers have described a new species of Vaejovis C. L. Koch, 1836 (Vaejovidae) from Mexico.

V. tenamaztlei Contreras-Félix, Francke & Bryson Jr., 2015

Abstract:A new species of Vaejovis is described from the Mexican state of Aguascalientes. It is assigned to the “mexicanus” group and compared with similar species from Jalisco, Guanajuato, and San Luis Potosí. A map with their known distributions is provided.

Reference:
Contreras-Felix GA, Francke OF, Bryson Jr RW. A new species of the “mexicanus” group of the genus Vaejovis C. L. Koch, 1836 from the Mexican state of Aguascalientes (Scorpiones: Vaejovidae). Zootaxa. 2015;3936(1):131-40. [Subscription required for full text]

06 March, 2015

Morphological anomalies of scorpions are rare, but a few case have been reported. In a recent papers, Rolando Teruel and José Guadalupe Baldazo-Monsivaiz report of a specimen of Mesomexovis punctatus (Karsch, 1879) (Vaejovidae) from Mexico with a combination of hermaphroditism, gynandromorphism, and pectinal duplication (i.e., presence of four pectines).Abstract:In the present note, we describe in detail an aberrant anomalous specimen of the scorpion Mesomexovis punctatus (Karsch, 1879) (Vaejovidae). This strange individual is an adult and exhibits a combination of hermaphroditism, gynandromorphism, and pectinal duplication (i.e., presence of four pectines); the latter represents the first report ever made of such teratology. It was collected by the authors in northeastern Guerrero State, Mexico.

05 March, 2015

Last Fall a major reference book on scorpion venoms and scorpionism around the world was published. I haven't read this book yet, but I will later and I plan to post information about the most interesting chapters in the blog. Unfortunately, the book is very expensive to purchase (unless your university has a Springer ebook subscription).

The publisher has the following information about the content of the book:

Provides accessible yet in-depth entries on the state of the art of scorpion venom research

Introduces scorpion biology and ecology and covers studies of their venom and “anti-venoms”

Contains species-centered overviews and examines the scorpion toxins

Explores the complex interactions of scorpion venoms with the immune system

Scorpions have fascinated humans for a
long time, ﬁrst and foremost because of the harm the sting of a few
species could cause but also due to their unique natural history and for
the many biologically active compounds found in their venoms. This
volume of the Toxinology handbook series covers all those
aspects. The subjects are divided into seven sections starting with an
introduction to the general aspects of scorpion biology and ecology,
followed by the description of the “envenomation” pathophysiology,
pharmacokinetics, and pharmacodynamics of venoms and their complex
interactions with the immune system. The future of anti-scorpion venom
therapy is then covered in two chapters dedicated to alternatives to the
century-old techniques currently used to produce “anti-venoms”. The
next section presents a world tour of “scorpionism” and dangerous
scorpion species and their impact on human health. It is worth
remembering that envenomation due to scorpion stings is a substantial
health hazard in Asian, Middle Eastern, African, and Latin American
countries, with over one million people stung by scorpions every year,
resulting in more than 3,000 deaths. Species-centered overviews of
“scorpion venoms” are presented in the next section, after which a
section details the two main types of “scorpion toxins”. The last
section covers high-throughput transcriptome and proteome screenings now
known as “venomics”.

Frantisek Kovarik and co-workers have now published part II of their study of the scorpion fauna of Ethiopia (part I was about the genus Butheoloides Hirst, 1925). In the recent paper, the status of the genus Babycurus Karsch, 1886 (Buthidae) is presented. Two new species are described.

Abstract:Two new species, Babycurus dunlopi sp. n. and B. sofomarensis sp. n. from Ethiopia, are described, compared with other species and fully illustrated with color photos of habitus and localities. B. subpunctatus Borelli, 1925 is recorded for the first time in Ethiopia, Somali Province. All data about the distribution of Babycurus Karsch, 1886 in Ethiopia including photos of all known Ethiopian localities of Babycurus are summarized. B. wituensis taramassoi Borelli, 1919 is raised back to species status as B. taramassoi Borelli, 1919.

04 March, 2015

Wilson Lourenco and Dinh-Sac Pham have described a new species of Scorpiops Peters, 1861 (Euscorpiidae) collected in a limestone formation covered by rainforest, in the extreme north of Vietnam.

Scorpiops dentidactylus Lourenco & Pham, 2015

A new subgenus, Vietscorpiops Lourneco & Pham, 2015, is also presented in the paper.Abstract:Scorpiops (Vietscorpiops) dentidactylus subgen. n. et sp. n., belonging to the family Euscorpiidae Laurie, 1896, is described on the basis of single male collected in Dien Bien Province, Muong Nhe District, Nam Vi Commune, in a limestone formation covered by rainforest, in the extreme North of Vietnam. The new subgenus is characterized by the presence of only two lateral eyes represented by lenses and a strong, peculiar apophysis on the internal face of the chelal movable finger. This new scorpion taxon may represent yet another endemic element in the fauna of Southeast Asia, mainly Vietnam and Laos.Reference:
Lourenco WR, Pham DS. An interesting new subgenus of Scorpiops Peters, 1861 from North Vietnam (Scorpiones: Euscorpiidae: Scorpiopinae). Comptes Rendus Biologies. 2015 Mar;338(3):212-7. [Subscription required for full text]